include/asm-cris/arch-v32/atomic.h

   1 #ifndef __ASM_CRIS_ARCH_ATOMIC__
   2 #define __ASM_CRIS_ARCH_ATOMIC__
   3
   4 #include <asm/system.h>
   5
   6 extern void cris_spin_unlock(void *l, int val);
   7 extern void cris_spin_lock(void *l);
   8 extern int cris_spin_trylock(void* l);
   9
  10 #ifndef CONFIG_SMP
  11 #define cris_atomic_save(addr, flags) local_irq_save(flags);
  12 #define cris_atomic_restore(addr, flags) local_irq_restore(flags);
  13 #else
  14
  15 extern spinlock_t cris_atomic_locks[];
  16 #define LOCK_COUNT 128
  17 #define HASH_ADDR(a) (((int)a) & 127)
  18
  19 #define cris_atomic_save(addr, flags) \
  20   local_irq_save(flags); \
  21   cris_spin_lock((void*)&cris_atomic_locks[HASH_ADDR(addr)].lock);
  22
  23 #define cris_atomic_restore(addr, flags) \
  24   { \
  25     spinlock_t *lock = (void*)&cris_atomic_locks[HASH_ADDR(addr)]; \
  26     __asm__ volatile ("move.d %1,%0" \
  27                           : "=m" (lock->lock) \
  28                           : "r" (1) \
  29                           : "memory"); \
  30     local_irq_restore(flags); \
  31   }
  32
  33 #endif
  34
  35 #endif
  36